RAID Creation

From Linux Raid Wiki
(Difference between revisions)
Jump to: navigation, search
(recommend --metadata=1.2)
(Give an example)
Line 4: Line 4:
  
 
With mdadm, you specify the raid device to create, the raid mode (raid0, raid1, raid10, raid5, raid6 etc) and the component devices.
 
With mdadm, you specify the raid device to create, the raid mode (raid0, raid1, raid10, raid5, raid6 etc) and the component devices.
 +
 +
For example:
 +
 +
mdadm --create --bitmap=internal --metadata=1.2 --level=1 --raid-devices=2 /dev/md1 /dev/sda /dev/sdb
  
 
You can also configure many aspects of your array:
 
You can also configure many aspects of your array:

Revision as of 00:14, 5 October 2013

MD devices are created using the Create mode of mdadm.

As of lvm2 2.02.87 and linux 2.6.32, LVM can be used to create MD-RAID volumes (lvcreate --type=raidN --stripes=numstripes). This offers a strong guarantee that the component devices won't be exposed.

With mdadm, you specify the raid device to create, the raid mode (raid0, raid1, raid10, raid5, raid6 etc) and the component devices.

For example:

mdadm --create --bitmap=internal --metadata=1.2 --level=1 --raid-devices=2 /dev/md1 /dev/sda /dev/sdb

You can also configure many aspects of your array:

One question that frequently comes up with linux raid is:

“Why does linux raid do 'resync' when I create a clean array? Can I skip that?”

The answer is usually "NO". For more details see Initial Array Creation

Personal tools